1 /*-------------------------------------------------------------------------
4 * This file contains general postgres administration and initialization
5 * stuff that used to be spread out between the following files:
6 * globals.h global variables
7 * pdir.h directory path crud
8 * pinit.h postgres initialization
9 * pmod.h processing modes
10 * Over time, this has also become the preferred place for widely known
11 * resource-limitation stuff, such as work_mem and check_stack_depth().
13 * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
14 * Portions Copyright (c) 1994, Regents of the University of California
16 * $PostgreSQL: pgsql/src/include/miscadmin.h,v 1.161 2004/05/28 05:13:24 tgl Exp $
19 * some of the information in this file should be moved to
22 *-------------------------------------------------------------------------
28 /*****************************************************************************
29 * System interrupt and critical section handling
31 * There are two types of interrupts that a running backend needs to accept
32 * without messing up its state: QueryCancel (SIGINT) and ProcDie (SIGTERM).
33 * In both cases, we need to be able to clean up the current transaction
34 * gracefully, so we can't respond to the interrupt instantaneously ---
35 * there's no guarantee that internal data structures would be self-consistent
36 * if the code is interrupted at an arbitrary instant. Instead, the signal
37 * handlers set flags that are checked periodically during execution.
39 * The CHECK_FOR_INTERRUPTS() macro is called at strategically located spots
40 * where it is normally safe to accept a cancel or die interrupt. In some
41 * cases, we invoke CHECK_FOR_INTERRUPTS() inside low-level subroutines that
42 * might sometimes be called in contexts that do *not* want to allow a cancel
43 * or die interrupt. The HOLD_INTERRUPTS() and RESUME_INTERRUPTS() macros
44 * allow code to ensure that no cancel or die interrupt will be accepted,
45 * even if CHECK_FOR_INTERRUPTS() gets called in a subroutine. The interrupt
46 * will be held off until CHECK_FOR_INTERRUPTS() is done outside any
47 * HOLD_INTERRUPTS() ... RESUME_INTERRUPTS() section.
49 * Special mechanisms are used to let an interrupt be accepted when we are
50 * waiting for a lock or when we are waiting for command input (but, of
51 * course, only if the interrupt holdoff counter is zero). See the
52 * related code for details.
54 * A related, but conceptually distinct, mechanism is the "critical section"
55 * mechanism. A critical section not only holds off cancel/die interrupts,
56 * but causes any ereport(ERROR) or ereport(FATAL) to become ereport(PANIC)
57 * --- that is, a system-wide reset is forced. Needless to say, only really
58 * *critical* code should be marked as a critical section! Currently, this
59 * mechanism is only used for XLOG-related code.
61 *****************************************************************************/
64 /* these are marked volatile because they are set by signal handlers: */
65 extern DLLIMPORT volatile bool InterruptPending;
66 extern volatile bool QueryCancelPending;
67 extern volatile bool ProcDiePending;
69 /* these are marked volatile because they are examined by signal handlers: */
70 extern volatile bool ImmediateInterruptOK;
71 extern volatile uint32 InterruptHoldoffCount;
72 extern volatile uint32 CritSectionCount;
74 /* in tcop/postgres.c */
75 extern void ProcessInterrupts(void);
78 #define CHECK_FOR_INTERRUPTS() \
80 if (InterruptPending) \
81 ProcessInterrupts(); \
84 #define CHECK_FOR_INTERRUPTS() \
86 if (WaitForSingleObject(pgwin32_signal_event,0) == WAIT_OBJECT_0) \
87 pgwin32_dispatch_queued_signals(); \
88 if (InterruptPending) \
89 ProcessInterrupts(); \
94 #define HOLD_INTERRUPTS() (InterruptHoldoffCount++)
96 #define RESUME_INTERRUPTS() \
98 Assert(InterruptHoldoffCount > 0); \
99 InterruptHoldoffCount--; \
102 #define START_CRIT_SECTION() (CritSectionCount++)
104 #define END_CRIT_SECTION() \
106 Assert(CritSectionCount > 0); \
107 CritSectionCount--; \
111 /*****************************************************************************
113 *****************************************************************************/
116 * from postmaster/postmaster.c
118 extern bool ClientAuthInProgress;
120 extern int PostmasterMain(int argc, char *argv[]);
121 extern void ClosePostmasterPorts(bool pgstat_too);
123 extern pid_t postmaster_forkexec(int argc, char *argv[]);
124 extern int SubPostmasterMain(int argc, char *argv[]);
127 #define PG_VERSIONSTR "postgres (PostgreSQL) " PG_VERSION "\n"
130 * from utils/init/globals.c
132 extern pid_t PostmasterPid;
133 extern bool IsPostmasterEnvironment;
134 extern bool IsUnderPostmaster;
136 extern bool ExitOnAnyError;
138 extern char *DataDir;
140 extern DLLIMPORT int MyProcPid;
141 extern struct Port *MyProcPort;
142 extern long MyCancelKey;
144 extern char OutputFileName[];
145 extern char my_exec_path[];
146 extern char pkglib_path[];
148 extern char postgres_exec_path[];
152 * done in storage/backendid.h for now.
154 * extern BackendId MyBackendId;
156 extern DLLIMPORT Oid MyDatabaseId;
159 * Date/Time Configuration
161 * DateStyle defines the output formatting choice for date/time types:
162 * USE_POSTGRES_DATES specifies traditional Postgres format
163 * USE_ISO_DATES specifies ISO-compliant format
164 * USE_SQL_DATES specifies Oracle/Ingres-compliant format
165 * USE_GERMAN_DATES specifies German-style dd.mm/yyyy
167 * DateOrder defines the field order to be assumed when reading an
168 * ambiguous date (anything not in YYYY-MM-DD format, with a four-digit
169 * year field first, is taken to be ambiguous):
170 * DATEORDER_YMD specifies field order yy-mm-dd
171 * DATEORDER_DMY specifies field order dd-mm-yy ("European" convention)
172 * DATEORDER_MDY specifies field order mm-dd-yy ("US" convention)
174 * In the Postgres and SQL DateStyles, DateOrder also selects output field
175 * order: day comes before month in DMY style, else month comes before day.
177 * The user-visible "DateStyle" run-time parameter subsumes both of these.
180 /* valid DateStyle values */
181 #define USE_POSTGRES_DATES 0
182 #define USE_ISO_DATES 1
183 #define USE_SQL_DATES 2
184 #define USE_GERMAN_DATES 3
186 /* valid DateOrder values */
187 #define DATEORDER_YMD 0
188 #define DATEORDER_DMY 1
189 #define DATEORDER_MDY 2
191 extern int DateStyle;
192 extern int DateOrder;
195 * HasCTZSet is true if user has set timezone as a numeric offset from UTC.
196 * If so, CTimeZone is the timezone offset in seconds (using the Unix-ish
197 * sign convention, ie, positive offset is west of UTC, rather than the
198 * SQL-ish convention that positive is east of UTC).
200 extern bool HasCTZSet;
201 extern int CTimeZone;
203 #define MAXTZLEN 10 /* max TZ name len, not counting tr. null */
205 extern bool enableFsync;
206 extern bool allowSystemTableMods;
207 extern DLLIMPORT int work_mem;
208 extern DLLIMPORT int maintenance_work_mem;
210 extern int VacuumCostPageHit;
211 extern int VacuumCostPageMiss;
212 extern int VacuumCostPageDirty;
213 extern int VacuumCostLimit;
214 extern int VacuumCostNaptime;
216 extern int VacuumCostBalance;
217 extern bool VacuumCostActive;
220 * A few postmaster startup options are exported here so the
221 * configuration file processor can access them.
223 extern bool EnableSSL;
224 extern bool SilentMode;
225 extern int MaxBackends;
226 extern int ReservedBackends;
227 extern DLLIMPORT int NBuffers;
228 extern int PostPortNumber;
229 extern int Unix_socket_permissions;
230 extern char *Unix_socket_group;
231 extern char *UnixSocketDir;
232 extern char *ListenAddresses;
235 /* in tcop/postgres.c */
236 extern void check_stack_depth(void);
239 /*****************************************************************************
241 * POSTGRES directory path definitions. *
242 *****************************************************************************/
244 extern char *DatabasePath;
246 /* in utils/misc/database.c */
247 extern void GetRawDatabaseInfo(const char *name, Oid *db_id, char *path);
249 /* now in utils/init/miscinit.c */
250 extern void SetDatabasePath(const char *path);
252 extern char *GetUserNameFromId(AclId userid);
253 extern AclId GetUserId(void);
254 extern void SetUserId(AclId userid);
255 extern AclId GetSessionUserId(void);
256 extern void SetSessionUserId(AclId userid);
257 extern void InitializeSessionUserId(const char *username);
258 extern void InitializeSessionUserIdStandalone(void);
259 extern void SetSessionAuthorization(AclId userid, bool is_superuser);
261 extern void SetDataDir(const char *dir);
263 /* in utils/misc/superuser.c */
264 extern bool superuser(void); /* current user is superuser */
265 extern bool superuser_arg(AclId userid); /* given user is superuser */
268 /*****************************************************************************
270 * POSTGRES processing mode definitions. *
271 *****************************************************************************/
275 * There are three processing modes in POSTGRES. They are
276 * BootstrapProcessing or "bootstrap," InitProcessing or
277 * "initialization," and NormalProcessing or "normal."
279 * The first two processing modes are used during special times. When the
280 * system state indicates bootstrap processing, transactions are all given
281 * transaction id "one" and are consequently guaranteed to commit. This mode
282 * is used during the initial generation of template databases.
284 * Initialization mode: used while starting a backend, until all normal
285 * initialization is complete. Some code behaves differently when executed
286 * in this mode to enable system bootstrapping.
288 * If a POSTGRES binary is in normal mode, then all code may be executed
292 typedef enum ProcessingMode
294 BootstrapProcessing, /* bootstrap creation of template database */
295 InitProcessing, /* initializing system */
296 NormalProcessing /* normal processing */
299 extern ProcessingMode Mode;
301 #define IsBootstrapProcessingMode() ((bool)(Mode == BootstrapProcessing))
302 #define IsInitProcessingMode() ((bool)(Mode == InitProcessing))
303 #define IsNormalProcessingMode() ((bool)(Mode == NormalProcessing))
305 #define SetProcessingMode(mode) \
307 AssertArg((mode) == BootstrapProcessing || \
308 (mode) == InitProcessing || \
309 (mode) == NormalProcessing); \
313 #define GetProcessingMode() Mode
316 /*****************************************************************************
318 * POSTGRES initialization and cleanup definitions. *
319 *****************************************************************************/
321 /* in utils/init/postinit.c */
322 extern void InitPostgres(const char *dbname, const char *username);
323 extern void BaseInit(void);
325 /* in utils/init/miscinit.c */
326 extern void IgnoreSystemIndexes(bool mode);
327 extern bool IsIgnoringSystemIndexes(void);
328 extern void SetReindexProcessing(Oid heapOid, Oid indexOid);
329 extern bool ReindexIsProcessingHeap(Oid heapOid);
330 extern bool ReindexIsProcessingIndex(Oid indexOid);
331 extern void CreateDataDirLockFile(const char *datadir, bool amPostmaster);
332 extern void CreateSocketLockFile(const char *socketfile, bool amPostmaster);
333 extern void TouchSocketLockFile(void);
334 extern void RecordSharedMemoryInLockFile(unsigned long id1,
336 extern void ValidatePgVersion(const char *path);
337 extern void process_preload_libraries(char *preload_libraries_string);
339 #endif /* MISCADMIN_H */